What's my IP — and a whole fleet of tools that don't phone home.
For 30 years ipcow answered one question. Now it answers a hundred — IP, DNS & email checks on our own infrastructure. No ads, no trackers, no big-tech APIs.
Your public IP
IPv4
resolving…
IPv6
resolving…
Resolved on ipcow infrastructure — your IP is never sent to a third party.
- No trackers
- Quad9 by default
- Self-hosted
- No Google / Microsoft / Apple
The toolkit
See all →IP
What's My IP
Your public IPv4/IPv6 and the request headers that matter — no third parties involved.
CIDR Calculator
Network, broadcast, mask, wildcard, host range and counts for any IPv4/IPv6 CIDR.
IP Range → CIDR
Convert an inclusive IP range into the minimal set of CIDR blocks.
Network
Ping
ICMP round-trip time to a host, measured from our IPv4 and IPv6 probes.
Port Check
Test whether a TCP port is open and how fast it connects — over IPv4 and IPv6.
HTTP Check
Fetch a URL from our probes and report status, redirects and response time per stack.
SMTP Banner
Connect to a mail server and read its SMTP banner — mostly an IPv4 story.
Diagnostics
Speed Test
Download, upload and latency to our IPv4 and IPv6 servers — no Flash, no ads.
WebSocket Test
Check whether your network allows WebSocket connections — some proxies and firewalls block them.
Sound Test
Play test tones to check your speakers and headphones — left, right and both channels.
Webcam Test
Preview your camera and confirm it works — nothing ever leaves your browser.
DNS
Blacklist Check
Sweep an IP across dozens of DNS blacklists (RBLs) at once — see exactly which ones list it.
MX Lookup
List a domain’s mail exchangers in preference order.
SPF Check
Parse SPF and count DNS lookups against the RFC 7208 limit of 10 — the one that catches everyone.
DMARC Check
Resolve and validate the DMARC policy at _dmarc.<domain>.
DKIM Lookup
Fetch a DKIM public key by selector and flag weak keys.
Privacy is the default, not a setting.
No accounts, no ad networks, no big-tech round-trips. Just fast, honest tooling.
We don't track you
No analytics that identify you, no ad networks, no fingerprinting. The What's-My-IP widget talks only to our own endpoint.
No big-tech dependency
DNS over Quad9, RDAP from the registries, geolocation from self-hosted GeoLite2. Nothing routed through Google, Microsoft or Apple.
Built to be automated
Every tool has a clean JSON endpoint and a curl recipe. Metered API access and monitoring subscriptions are on the way.